I'd like to buy a laptop which is light,small, and of good quality.A. at ail B. in all C. above all D. after all 题目和参考答案——青夏教育精英家教网—

题目内容

( ) 10. I'd like to buy a laptop which is light,small, and of good quality.

A. at ail B. in all C. above all D. after all

10. C考查由all构成的介词短语的用法。atall（否定句)一点也不，(疑问句)究竟，到底；in all总共;above all首要的是，尤为重要的是；after all 毕竟，终究。句意：我想买一个轻便小巧，更重要的是质量好的手提电脑

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( ) 7. Who can the country out of its plan to conduct the nucleus weapon tests?

A. advise B. persuade C. suggest D. recommend

( ) 3. The English of today is very different from that of 500 years ago. In time some usage
will even completely.

A. die away B. die out C. die down D. die off

10. The money was repaid on time . (as)

按照他许诺的，钱被按时归还了。

( ) 5. He decided to travel to Hawaii with his family，so he reflised our to Europe.

A. addition B. consideration C. conclusion D. invitation

5. The pop stars' personal life is regularly discussed by people who do not know them but talk
as if . (be)

素不相识的人们经常谈论明星的私生活，就像是谈论他们的亲密朋友一样。

Pretoria, South Africa. Hundreds of swimmers are playing in the water along a South African beach. Suddenly a huge shark appears offshore and heads for the bathers. Before it can get close to the swimmers, the shark, for some mysterious reason, starts swimming parallel to the beach. Then it turns away from the shore and heads out to sea,leaving the swimmers untouched.

Such a scene will soon become common along shark infested(鲨鱼出没)shores. An electrical engineer from the University of Pretoria has developed an electrical system that repels(击退)sharks by controlling their movements. Confixsed by this action, the sharks end up turning away from the beach.

In this unusual shark repellent method, an insulated(绝缘的)cable is buried on the bottom of the sea around a beach from which people swim. When an electric current is sent through the cable， an electric field is produced in the water above the cable.

When the shark swims into the electric field, nerve cells just below the shark's skin detect the field. The electricity produces a reflex(反射)action in the shark's muscles, causing the dangerous animal with sharp teeth to swim parallel to the cable. Confused by increasing loss of control of its muscles, the shark suddenly changes its direction and heads seaward, away from the electric field.

In a test of the invisible new shark-repellent system，a cable was placed around a beach in St. Lucia,an island in the tropics. A protective net,which had been installed around the beach a long

time ago to keep sharks from swimmers, was left in place during the experiment.

When the electric field was left on for more than a year and a half,no sharks were found in the nets. However, when the power was turned off, 89 sharks ended up in the nets.

of many sharks，say biologists. Currently，thousands of sharks die each year when they become trapped in protective nets that surround holiday resorts in Africa and Australia. About 10 to 15 humans are killed by sharks annually.

( ) 4. In the first passage, why doesn't the shark attack the swimmers?

A. Because there are many swimmers in the water.

B. Because the shark doesn't want to eat the swimmers.

C. Because of some mysterious reason from the God.

D. Because there is an invisible electric field confusing the shark.

( ) 5. An electrical engineer from the University of Pretoria has developed -

A. a protective net B. a new shark-repellent system

C. the electric field D. an insulated cable

( ) 6. An electric field is produced in the water above the cable

A. only when the shark swims into the electric field

B. only when an insulated cable is buried on the bottom of the sea around a beach from which people swim

C. only when an electric current is sent through the cable

D. only when the sharks are trapped in protective nets

( ) 7. Which of the following is NOT true according to the passage?

A. Protective nets had been installed around the beach earlier than the new shark re?pellent system.

B. This new kind of shark repellent system will take place of the protective nets.

C. Thousands of sharks die and about 10 to 15 humans are killed by sharks each year in Africa and Australia since this new system was put into use.

D. Using the electric wall method instead of nets to protect bathers would avoid the needless death of many sharks.

16. Tm afraid you'd better not call me at 3 o'clock on the afternoon tomorrow. I then. (have)

你最好不要在明天下午3点钟给我打电话。那时我在开会。

( ) 4. Have you everything that is important in the book? They will help you a lot.

A,digested B. purchased C. distinguished D. dieted

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